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3877c560 | 1 | /* A class for building vector rtx constants. |
8d9254fc | 2 | Copyright (C) 2017-2020 Free Software Foundation, Inc. |
3877c560 RS |
3 | |
4 | This file is part of GCC. | |
5 | ||
6 | GCC is free software; you can redistribute it and/or modify it under | |
7 | the terms of the GNU General Public License as published by the Free | |
8 | Software Foundation; either version 3, or (at your option) any later | |
9 | version. | |
10 | ||
11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 | for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GCC; see the file COPYING3. If not see | |
18 | <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #ifndef GCC_RTX_VECTOR_BUILDER_H | |
21 | #define GCC_RTX_VECTOR_BUILDER_H | |
22 | ||
23 | #include "vector-builder.h" | |
24 | ||
25 | /* This class is used to build VECTOR_CSTs from a sequence of elements. | |
26 | See vector_builder for more details. */ | |
4ce6ab68 RS |
27 | class rtx_vector_builder : public vector_builder<rtx, machine_mode, |
28 | rtx_vector_builder> | |
3877c560 | 29 | { |
4ce6ab68 RS |
30 | typedef vector_builder<rtx, machine_mode, rtx_vector_builder> parent; |
31 | friend class vector_builder<rtx, machine_mode, rtx_vector_builder>; | |
3877c560 RS |
32 | |
33 | public: | |
34 | rtx_vector_builder () : m_mode (VOIDmode) {} | |
35 | rtx_vector_builder (machine_mode, unsigned int, unsigned int); | |
36 | rtx build (rtvec); | |
37 | rtx build (); | |
38 | ||
39 | machine_mode mode () const { return m_mode; } | |
40 | ||
41 | void new_vector (machine_mode, unsigned int, unsigned int); | |
42 | ||
43 | private: | |
44 | bool equal_p (rtx, rtx) const; | |
45 | bool allow_steps_p () const; | |
46 | bool integral_p (rtx) const; | |
47 | wide_int step (rtx, rtx) const; | |
48 | rtx apply_step (rtx, unsigned int, const wide_int &) const; | |
49 | bool can_elide_p (rtx) const { return true; } | |
50 | void note_representative (rtx *, rtx) {} | |
51 | ||
4ce6ab68 RS |
52 | static poly_uint64 shape_nelts (machine_mode mode) |
53 | { return GET_MODE_NUNITS (mode); } | |
54 | static poly_uint64 nelts_of (const_rtx x) | |
55 | { return CONST_VECTOR_NUNITS (x); } | |
56 | static unsigned int npatterns_of (const_rtx x) | |
57 | { return CONST_VECTOR_NPATTERNS (x); } | |
58 | static unsigned int nelts_per_pattern_of (const_rtx x) | |
59 | { return CONST_VECTOR_NELTS_PER_PATTERN (x); } | |
60 | ||
3877c560 RS |
61 | rtx find_cached_value (); |
62 | ||
63 | machine_mode m_mode; | |
64 | }; | |
65 | ||
66 | /* Create a new builder for a vector of mode MODE. Initially encode the | |
67 | value as NPATTERNS interleaved patterns with NELTS_PER_PATTERN elements | |
68 | each. */ | |
69 | ||
70 | inline | |
71 | rtx_vector_builder::rtx_vector_builder (machine_mode mode, | |
72 | unsigned int npatterns, | |
73 | unsigned int nelts_per_pattern) | |
74 | { | |
75 | new_vector (mode, npatterns, nelts_per_pattern); | |
76 | } | |
77 | ||
78 | /* Start building a new vector of mode MODE. Initially encode the value | |
79 | as NPATTERNS interleaved patterns with NELTS_PER_PATTERN elements each. */ | |
80 | ||
81 | inline void | |
82 | rtx_vector_builder::new_vector (machine_mode mode, unsigned int npatterns, | |
83 | unsigned int nelts_per_pattern) | |
84 | { | |
85 | m_mode = mode; | |
86 | parent::new_vector (GET_MODE_NUNITS (mode), npatterns, nelts_per_pattern); | |
87 | } | |
88 | ||
89 | /* Return true if elements ELT1 and ELT2 are equal. */ | |
90 | ||
91 | inline bool | |
92 | rtx_vector_builder::equal_p (rtx elt1, rtx elt2) const | |
93 | { | |
94 | return rtx_equal_p (elt1, elt2); | |
95 | } | |
96 | ||
97 | /* Return true if a stepped representation is OK. We don't allow | |
98 | linear series for anything other than integers, to avoid problems | |
99 | with rounding. */ | |
100 | ||
101 | inline bool | |
102 | rtx_vector_builder::allow_steps_p () const | |
103 | { | |
104 | return is_a <scalar_int_mode> (GET_MODE_INNER (m_mode)); | |
105 | } | |
106 | ||
107 | /* Return true if element ELT can be interpreted as an integer. */ | |
108 | ||
109 | inline bool | |
110 | rtx_vector_builder::integral_p (rtx elt) const | |
111 | { | |
112 | return CONST_SCALAR_INT_P (elt); | |
113 | } | |
114 | ||
115 | /* Return the value of element ELT2 minus the value of element ELT1. | |
116 | Both elements are known to be CONST_SCALAR_INT_Ps. */ | |
117 | ||
118 | inline wide_int | |
119 | rtx_vector_builder::step (rtx elt1, rtx elt2) const | |
120 | { | |
121 | return wi::sub (rtx_mode_t (elt2, GET_MODE_INNER (m_mode)), | |
122 | rtx_mode_t (elt1, GET_MODE_INNER (m_mode))); | |
123 | } | |
124 | ||
125 | #endif |